[FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[OvchinnikovDmitrii]

---
 libavcodec/avcodec.h   | 8 ++++++++
 libavcodec/codec_par.h | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7365eb5cc0..66df571afc 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -585,6 +585,14 @@ typedef struct AVCodecContext {
      */
     int coded_width, coded_height;
 
+    /**
+     * The dimensions of the crop, usually from container.
+     */
+    int crop_top;
+    int crop_left;
+    int crop_bottom;
+    int crop_right;
+
     /**
      * the number of pictures in a group of pictures, or 0 for intra_only
      * - encoding: Set by user.
diff --git a/libavcodec/codec_par.h b/libavcodec/codec_par.h
index 7660791a12..c730a79957 100644
--- a/libavcodec/codec_par.h
+++ b/libavcodec/codec_par.h
@@ -210,6 +210,14 @@ typedef struct AVCodecParameters {
      * Audio only. The channel layout and number of channels.
      */
     AVChannelLayout ch_layout;
+
+    /**
+     * The dimensions of the crop, usually from container.
+     */
+    int crop_top;
+    int crop_left;
+    int crop_bottom;
+    int crop_right;
 } AVCodecParameters;
 
 /**
-- 
2.30.0.windows.2

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[FFmpeg-devel] [crop support for matroska demuxer 2/3] libavcodec: Public code to support container crop

[OvchinnikovDmitrii]

Support both simple and receive_frame api
The container crop information is applied additional to frame crop information
---
 libavcodec/codec_par.c |  8 ++++++++
 libavcodec/decode.c    | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/libavcodec/codec_par.c b/libavcodec/codec_par.c
index abda649aa8..f74964a817 100644
--- a/libavcodec/codec_par.c
+++ b/libavcodec/codec_par.c
@@ -118,6 +118,10 @@ int avcodec_parameters_from_context(AVCodecParameters *par,
         par->format              = codec->pix_fmt;
         par->width               = codec->width;
         par->height              = codec->height;
+        par->crop_top           = codec->crop_top;
+        par->crop_left          = codec->crop_left;
+        par->crop_bottom        = codec->crop_bottom;
+        par->crop_right         = codec->crop_right;
         par->field_order         = codec->field_order;
         par->color_range         = codec->color_range;
         par->color_primaries     = codec->color_primaries;
@@ -199,6 +203,10 @@ int avcodec_parameters_to_context(AVCodecContext *codec,
         codec->pix_fmt                = par->format;
         codec->width                  = par->width;
         codec->height                 = par->height;
+        codec->crop_top               = par->crop_top;
+        codec->crop_left              = par->crop_left;
+        codec->crop_bottom            = par->crop_bottom;
+        codec->crop_right             = par->crop_right;
         codec->field_order            = par->field_order;
         codec->color_range            = par->color_range;
         codec->color_primaries        = par->color_primaries;
diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 6be2d3d6ed..548225c904 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -324,6 +324,16 @@ static inline int decode_simple_internal(AVCodecContext *avctx, AVFrame *frame,
     emms_c();
     actual_got_frame = got_frame;
 
+    /* crop for simple api mode. apply additional container crop info to frame */
+    if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
+        if (avctx->crop_top != 0 || avctx->crop_left != 0 || avctx->crop_right != 0 || avctx->crop_bottom != 0){
+            frame->crop_top    += avctx->crop_top;
+            frame->crop_left   += avctx->crop_left;
+            frame->crop_right  += avctx->crop_right;
+            frame->crop_bottom += avctx->crop_bottom;
+        }
+    }
+
     if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
         if (frame->flags & AV_FRAME_FLAG_DISCARD)
             got_frame = 0;
@@ -707,6 +717,16 @@ int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
 
     if (avci->buffer_frame->buf[0]) {
         av_frame_move_ref(frame, avci->buffer_frame);
+
+        /* crop for receive_frame api mode. apply additional container crop info to frame */
+        if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
+            if (avctx->crop_top != 0 || avctx->crop_left != 0 || avctx->crop_right != 0 || avctx->crop_bottom != 0){
+                frame->crop_top    += avctx->crop_top;
+                frame->crop_left   += avctx->crop_left;
+                frame->crop_right  += avctx->crop_right;
+                frame->crop_bottom += avctx->crop_bottom;
+            }
+        }
     } else {
         ret = decode_receive_frame_internal(avctx, frame);
         if (ret < 0)
-- 
2.30.0.windows.2

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[FFmpeg-devel] [crop support for matroska demuxer 3/3] libavformat\matroskadec.c: crop support for matroska demuxer.

[OvchinnikovDmitrii]

In webm specification, it supports cropping information. (https://www.webmproject.org/docs/container/)
In ffmpeg, the implementation of webm is a subset of matroska. In matroskadec.c, those cropping related four fields are forced to 0.

for the sample file with crop (crop_bottom =8, crop_top=crop_left=crop_right=0.)
ffmpeg.exe -i  test_with_container_crop.webm -pix_fmt yuv420p -y output.yuv

original ffmpeg code - the output.yuv resolution is 1920x1088
changed code - the output.yuv resolution is 1920x1080"
---
 libavformat/matroskadec.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index d582f566a2..e7b00cdbe6 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -210,6 +210,10 @@ typedef struct MatroskaTrackVideo {
     uint64_t pixel_width;
     uint64_t pixel_height;
     EbmlBin  color_space;
+    uint64_t pixel_cropt;
+    uint64_t pixel_cropl;
+    uint64_t pixel_cropb;
+    uint64_t pixel_cropr;
     uint64_t display_unit;
     uint64_t interlaced;
     uint64_t field_order;
@@ -517,10 +521,10 @@ static EbmlSyntax matroska_track_video[] = {
     { MATROSKA_ID_VIDEOALPHAMODE,      EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } },
     { MATROSKA_ID_VIDEOCOLOR,          EBML_NEST,  0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
     { MATROSKA_ID_VIDEOPROJECTION,     EBML_NEST,  0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
-    { MATROSKA_ID_VIDEOPIXELCROPB,     EBML_NONE },
-    { MATROSKA_ID_VIDEOPIXELCROPT,     EBML_NONE },
-    { MATROSKA_ID_VIDEOPIXELCROPL,     EBML_NONE },
-    { MATROSKA_ID_VIDEOPIXELCROPR,     EBML_NONE },
+    { MATROSKA_ID_VIDEOPIXELCROPT,     EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, pixel_cropt), {.u = 0 } },
+    { MATROSKA_ID_VIDEOPIXELCROPL,     EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, pixel_cropl), {.u = 0 } },
+    { MATROSKA_ID_VIDEOPIXELCROPB,     EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, pixel_cropb), {.u = 0 } },
+    { MATROSKA_ID_VIDEOPIXELCROPR,     EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, pixel_cropr), {.u = 0 } },
     { MATROSKA_ID_VIDEODISPLAYUNIT,    EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
     { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, interlaced),  { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
     { MATROSKA_ID_VIDEOFIELDORDER,     EBML_UINT,  0, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
@@ -2879,6 +2883,11 @@ static int matroska_parse_tracks(AVFormatContext *s)
             st->codecpar->width      = track->video.pixel_width;
             st->codecpar->height     = track->video.pixel_height;
 
+            st->codecpar->crop_top   = track->video.pixel_cropt;
+            st->codecpar->crop_left  = track->video.pixel_cropl;
+            st->codecpar->crop_bottom= track->video.pixel_cropb;
+            st->codecpar->crop_right = track->video.pixel_cropr;
+
             if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
                 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
             else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
-- 
2.30.0.windows.2

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Re: [FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[Hendrik Leppkes]

On Sat, Oct 1, 2022 at 8:14 AM OvchinnikovDmitrii
<ovchinnikov.dmitrii@gmail.com> wrote:
>
> ---
>  libavcodec/avcodec.h   | 8 ++++++++
>  libavcodec/codec_par.h | 8 ++++++++
>  2 files changed, 16 insertions(+)
>
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 7365eb5cc0..66df571afc 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -585,6 +585,14 @@ typedef struct AVCodecContext {
>       */
>      int coded_width, coded_height;
>
> +    /**
> +     * The dimensions of the crop, usually from container.
> +     */
> +    int crop_top;
> +    int crop_left;
> +    int crop_bottom;
> +    int crop_right;
> +
>      /**
>       * the number of pictures in a group of pictures, or 0 for intra_only
>       * - encoding: Set by user.
> diff --git a/libavcodec/codec_par.h b/libavcodec/codec_par.h
> index 7660791a12..c730a79957 100644
> --- a/libavcodec/codec_par.h
> +++ b/libavcodec/codec_par.h
> @@ -210,6 +210,14 @@ typedef struct AVCodecParameters {
>       * Audio only. The channel layout and number of channels.
>       */
>      AVChannelLayout ch_layout;
> +
> +    /**
> +     * The dimensions of the crop, usually from container.
> +     */
> +    int crop_top;
> +    int crop_left;
> +    int crop_bottom;
> +    int crop_right;
>  } AVCodecParameters;
>

All of these should be size_t (and in AVCodecContext as well,
naturally), matching the type in AVFrame.

- Hendrik
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Re: [FFmpeg-devel] [crop support for matroska demuxer 2/3] libavcodec: Public code to support container crop

[Hendrik Leppkes]

On Sat, Oct 1, 2022 at 8:14 AM OvchinnikovDmitrii
<ovchinnikov.dmitrii@gmail.com> wrote:
>
> Support both simple and receive_frame api
> The container crop information is applied additional to frame crop information
> ---
>  libavcodec/codec_par.c |  8 ++++++++
>  libavcodec/decode.c    | 20 ++++++++++++++++++++
>  2 files changed, 28 insertions(+)
>
> diff --git a/libavcodec/codec_par.c b/libavcodec/codec_par.c
> index abda649aa8..f74964a817 100644
> --- a/libavcodec/codec_par.c
> +++ b/libavcodec/codec_par.c
> @@ -118,6 +118,10 @@ int avcodec_parameters_from_context(AVCodecParameters *par,
>          par->format              = codec->pix_fmt;
>          par->width               = codec->width;
>          par->height              = codec->height;
> +        par->crop_top           = codec->crop_top;
> +        par->crop_left          = codec->crop_left;
> +        par->crop_bottom        = codec->crop_bottom;
> +        par->crop_right         = codec->crop_right;
>          par->field_order         = codec->field_order;
>          par->color_range         = codec->color_range;
>          par->color_primaries     = codec->color_primaries;
> @@ -199,6 +203,10 @@ int avcodec_parameters_to_context(AVCodecContext *codec,
>          codec->pix_fmt                = par->format;
>          codec->width                  = par->width;
>          codec->height                 = par->height;
> +        codec->crop_top               = par->crop_top;
> +        codec->crop_left              = par->crop_left;
> +        codec->crop_bottom            = par->crop_bottom;
> +        codec->crop_right             = par->crop_right;
>          codec->field_order            = par->field_order;
>          codec->color_range            = par->color_range;
>          codec->color_primaries        = par->color_primaries;
> diff --git a/libavcodec/decode.c b/libavcodec/decode.c
> index 6be2d3d6ed..548225c904 100644
> --- a/libavcodec/decode.c
> +++ b/libavcodec/decode.c
> @@ -324,6 +324,16 @@ static inline int decode_simple_internal(AVCodecContext *avctx, AVFrame *frame,
>      emms_c();
>      actual_got_frame = got_frame;
>
> +    /* crop for simple api mode. apply additional container crop info to frame */
> +    if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
> +        if (avctx->crop_top != 0 || avctx->crop_left != 0 || avctx->crop_right != 0 || avctx->crop_bottom != 0){
> +            frame->crop_top    += avctx->crop_top;
> +            frame->crop_left   += avctx->crop_left;
> +            frame->crop_right  += avctx->crop_right;
> +            frame->crop_bottom += avctx->crop_bottom;
> +        }
> +    }
> +
>      if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
>          if (frame->flags & AV_FRAME_FLAG_DISCARD)
>              got_frame = 0;
> @@ -707,6 +717,16 @@ int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
>
>      if (avci->buffer_frame->buf[0]) {
>          av_frame_move_ref(frame, avci->buffer_frame);
> +
> +        /* crop for receive_frame api mode. apply additional container crop info to frame */
> +        if (avctx->codec->type == AVMEDIA_TYPE_VIDEO) {
> +            if (avctx->crop_top != 0 || avctx->crop_left != 0 || avctx->crop_right != 0 || avctx->crop_bottom != 0){
> +                frame->crop_top    += avctx->crop_top;
> +                frame->crop_left   += avctx->crop_left;
> +                frame->crop_right  += avctx->crop_right;
> +                frame->crop_bottom += avctx->crop_bottom;
> +            }
> +        }

Somehow I don't feel like adding the two crops together is really
going to do what most users would expect to happen. It just feels
weird.
It also changes the decoder crop information, and an API user does not
get the pure information from the decoder, but rather an "interpreted"
form. As an API user, I do not get the ability here to extract the
pure decoder crop info, unless I manually null out the container info
beforehand, or subtract it again, both of which seems odd and
undesirable to me. Shouldn't I be provided with clean information, and
then I (the API user) can choose how to act?

- Hendrik
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Re: [FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[Timo Rothenpieler]

On 01.10.2022 08:13, OvchinnikovDmitrii wrote:
> ---
>   libavcodec/avcodec.h   | 8 ++++++++
>   libavcodec/codec_par.h | 8 ++++++++
>   2 files changed, 16 insertions(+)
> 
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 7365eb5cc0..66df571afc 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -585,6 +585,14 @@ typedef struct AVCodecContext {
>        */
>       int coded_width, coded_height;
>   
> +    /**
> +     * The dimensions of the crop, usually from container.
> +     */
> +    int crop_top;
> +    int crop_left;
> +    int crop_bottom;
> +    int crop_right;
> +

Shouldn't these be added at the very end, to not break ABI?

I'm also not very convinced this kind of information really belongs into 
AVCodecContext and codecpar.
Can't it just be frame-sidedata?
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Re: [FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[Anton Khirnov]

Quoting Timo Rothenpieler (2022-10-01 13:24:26)
> On 01.10.2022 08:13, OvchinnikovDmitrii wrote:
> > ---
> >   libavcodec/avcodec.h   | 8 ++++++++
> >   libavcodec/codec_par.h | 8 ++++++++
> >   2 files changed, 16 insertions(+)
> > 
> > diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> > index 7365eb5cc0..66df571afc 100644
> > --- a/libavcodec/avcodec.h
> > +++ b/libavcodec/avcodec.h
> > @@ -585,6 +585,14 @@ typedef struct AVCodecContext {
> >        */
> >       int coded_width, coded_height;
> >   
> > +    /**
> > +     * The dimensions of the crop, usually from container.
> > +     */
> > +    int crop_top;
> > +    int crop_left;
> > +    int crop_bottom;
> > +    int crop_right;
> > +
> 
> Shouldn't these be added at the very end, to not break ABI?
> 

yes they should

> I'm also not very convinced this kind of information really belongs into 
> AVCodecContext and codecpar.
> Can't it just be frame-sidedata?

AVFrame already has fields for this, which are typically filled from
codec-level headers.

The idea here is to support container-level information, so some new
fields for lavf are certainly needed, but I'm not convinced just adding
them to AVCodecContext is the best solution. The semantics of these new
fields definitely need to be defined more precisely (like who sets them
and what does lavc do with the values).

-- 
Anton Khirnov
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Re: [FFmpeg-devel] [crop support for matroska demuxer 2/3] libavcodec: Public code to support container crop

[Anton Khirnov]

Quoting Hendrik Leppkes (2022-10-01 09:16:20)
> Somehow I don't feel like adding the two crops together is really
> going to do what most users would expect to happen. It just feels
> weird.
> It also changes the decoder crop information, and an API user does not
> get the pure information from the decoder, but rather an "interpreted"
> form. As an API user, I do not get the ability here to extract the
> pure decoder crop info, unless I manually null out the container info
> beforehand, or subtract it again, both of which seems odd and
> undesirable to me. Shouldn't I be provided with clean information, and
> then I (the API user) can choose how to act?

I agree, such policy decisions belong in the caller, not our libraries.

-- 
Anton Khirnov
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Re: [FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[James Almer]

On 10/1/2022 4:06 AM, Hendrik Leppkes wrote:
> On Sat, Oct 1, 2022 at 8:14 AM OvchinnikovDmitrii
> <ovchinnikov.dmitrii@gmail.com> wrote:
>>
>> ---
>>   libavcodec/avcodec.h   | 8 ++++++++
>>   libavcodec/codec_par.h | 8 ++++++++
>>   2 files changed, 16 insertions(+)
>>
>> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
>> index 7365eb5cc0..66df571afc 100644
>> --- a/libavcodec/avcodec.h
>> +++ b/libavcodec/avcodec.h
>> @@ -585,6 +585,14 @@ typedef struct AVCodecContext {
>>        */
>>       int coded_width, coded_height;
>>
>> +    /**
>> +     * The dimensions of the crop, usually from container.
>> +     */
>> +    int crop_top;
>> +    int crop_left;
>> +    int crop_bottom;
>> +    int crop_right;
>> +
>>       /**
>>        * the number of pictures in a group of pictures, or 0 for intra_only
>>        * - encoding: Set by user.
>> diff --git a/libavcodec/codec_par.h b/libavcodec/codec_par.h
>> index 7660791a12..c730a79957 100644
>> --- a/libavcodec/codec_par.h
>> +++ b/libavcodec/codec_par.h
>> @@ -210,6 +210,14 @@ typedef struct AVCodecParameters {
>>        * Audio only. The channel layout and number of channels.
>>        */
>>       AVChannelLayout ch_layout;
>> +
>> +    /**
>> +     * The dimensions of the crop, usually from container.
>> +     */
>> +    int crop_top;
>> +    int crop_left;
>> +    int crop_bottom;
>> +    int crop_right;
>>   } AVCodecParameters;
>>
> 
> All of these should be size_t (and in AVCodecContext as well,
> naturally), matching the type in AVFrame.

IMO the AVFrame ones should have not been size_t to begin with, not just 
because the actual dimensions you'll apply them to are int, but because 
these fields are not arch dependent or meant for the size of some object 
in memory.

> 
> - Hendrik
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Re: [FFmpeg-devel] [crop support for matroska demuxer 1/3] libavcodec: Add crop related fields to structure AVCodecContext and AVCodecParameters.

[Dmitrii Ovchinnikov]

Sent an updated version:
https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=7707.
1)
>>All of these should be size_t
The field type is still "int" according to James Almer's comment.
2) I placed the fields at the very end, according to a message from Timo
Rothenpieler.
3)
>>The semantics of these new fields definitely need to be defined more
precisely
Added a flag responsible for the behavior(enum
CONTAINER_CROPPING_POLICY_TYPE container_apply_cropping;).
When set to 1 (the default), libavcodec will apply container cropping
to codec cropping additionally.
When set to 2, libavcodec will use container cropping to overwrite
codec cropping (the final cropping uses container cropping parameters)
When set to 0, libavcodec will ignore container cropping parameters
(the final cropping uses codec cropping parameters)This field works with
"apply_cropping".
Only if apply_cropping is 1, this field works
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